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Feb 18 VH

 
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

PostPosted: Thu Feb 18, 2016 2:34 pm    Post subject: Feb 18 VH Reply with quote

Code:

+--------+--------------+---------------+
| 6 9 5  | 12   7   123 | 4    23  8    |
| 2 3 7  | 8    4   5   | 9    1   6    |
| 4 8 1  | 269  236 239 | 7    5   23   |
+--------+--------------+---------------+
| 1 5 4  | 3    28  7   | 28   6   9    |
| 3 6 28 | 1245 9   124 | 1258 247 1257 |
| 9 7 28 | 1245 258 6   | 3    24  125  |
+--------+--------------+---------------+
| 7 2 6  | 49   35  49  | 15   8   135  |
| 5 1 3  | 7    26  8   | 26   9   4    |
| 8 4 9  | 256  1   23  | 256  237 2357 |
+--------+--------------+---------------+

Play this puzzle online at the Daily Sudoku site

I got to this so late I thought that someone would have shared a solution by
now! A solution:
Quote:
X-Wing on 2 r48 followed by 26-3 XY-Wing pivot r8c5
Hugh
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

PostPosted: Thu Feb 18, 2016 4:03 pm    Post subject: a 1 stepper? Reply with quote

I considered r6c5 which if 8 sets r8c5 to 6 very quickly BUT if r6c5 is not 8 the XY wing 325 pivot r7c5 again makes r8c5 6 stte
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

PostPosted: Thu Feb 18, 2016 6:17 pm    Post subject: Re: a 1 stepper? Reply with quote

George Woods wrote:
I considered r6c5 which if 8 sets r8c5 to 6 very quickly BUT if r6c5 is not 8 the XY wing 325 pivot r7c5 again makes r8c5 6 stte
Neat. What would you call such a solution? Provisonal XY-wing Elimination?
Hugh
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Fri Feb 19, 2016 12:57 am    Post subject: Re: a 1 stepper? Reply with quote

hughwill wrote:
George Woods wrote:
I considered r6c5 which if 8 sets r8c5 to 6 very quickly BUT if r6c5 is not 8 the XY wing 325 pivot r7c5 again makes r8c5 6 stte
Neat. What would you call such a solution? Provisonal XY-wing Elimination?
Hugh


I would call it a Forcing Chain or something akin.

R6c5<8> 6r8c5
R8c5=8=> 6r8c5.


Quote:
Dongrave wrote in another thread

Darn x wings! There ought be a law against them.


I heartily agree.
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